OREAS 279 was prepared from a blend of high-grade gold-bearing ore and barren sediments (shale, quartz and limestone). The ore was sourced from the Leeville Mine, located near the western crest of the Tuscarora Mountains, about 20 miles northwest of Carlin in Nevada, USA. Leeville is an underground high-grade refractory gold deposit located on the Carlin Trend. Gold mineralisation is hosted within decalcified and weakly to moderately silicified rocks composed of 60 to 70% quartz, 10 to 30% dolomite, 5 to 12% kaolinite, 2 to 4% illite and 2 to 4% pyrite (Jackson et al, 1997).
OREAS 279 contains 72 certified values including C and S speciation and full ICP-OES and MS suites by aqua regia digestion.
| CRM Code |
Principle Certified Values |
State |
Matrix |
Mineralization |
| OREAS 279 |
Au 6.55 g/t |
C 1.13 % |
primary |
siliceous shale |
Carlin style |